Java program - Online Address Book (server client application)

package com.mycompany.onlineaddressbook; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.net.Socket; import java.util.Scanner; public class ClientJPB1 { private static final int SERVER_PORT = 8765; public static void main(String[] args) { DataOutputStream toServer; DataInputStream fromServer; Scanner input = new Scanner(System.in); String message; //attempt to connect to the server try { Socket socket = new Socket("localhost", SERVER_PORT); //create input stream to receive data //from the server fromServer = new DataInputStream(socket.getInputStream()); toServer = new DataOutputStream(socket.getOutputStream()); System.out.println("Online Address Book II\t"); System.out.println("----------------------\t"); System.out.println("List of Commands:\t"); System.out.println("Add"+", Delete"+", List"+", Who"+", Look"+", Quit"+", Login"+", Logout"+", Shutdown"); System.out.println("Send command to server:\t"); while(true) { System.out.print("Send command to server:\t"); message = input.nextLine(); toServer.writeUTF(message); if(message.equalsIgnoreCase("quit")) { break; } //received message: message = fromServer.readUTF(); System.out.println("Server says: " + message); } } catch(IOException ex) { ex.printStackTrace(); }//end try-catch }//end main }